A5114376774- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Organic Light-Emitting Diodes Research
- Perovskite Materials and Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- solar cell performance optimization
- Quantum Dots Synthesis And Properties
- Molecular Junctions and Nanostructures
- Luminescence and Fluorescent Materials
- Silicon and Solar Cell Technologies
- Semiconductor materials and interfaces
- Thin-Film Transistor Technologies
- Fullerene Chemistry and Applications
- Chalcogenide Semiconductor Thin Films
- Organic and Molecular Conductors Research
- Advanced Sensor and Energy Harvesting Materials
- Nanowire Synthesis and Applications
- Polydiacetylene-based materials and applications
- Porphyrin and Phthalocyanine Chemistry
- Lanthanide and Transition Metal Complexes
- Advanced Memory and Neural Computing
- Silicone and Siloxane Chemistry
- TiO2 Photocatalysis and Solar Cells
- Photochromic and Fluorescence Chemistry
Laboratoire de l'Intégration du Matériau au Système
2014-2024
Institut Polytechnique de Bordeaux
2015-2024
Université de Bordeaux
2015-2024
Centre National de la Recherche Scientifique
2014-2024
London Institute for Mathematical Sciences
2022
Imperial College London
2022
Cambridge University Press
2018
Division of Materials Research
2018
New York University Press
2018
École Nationale Supérieure de Chimie, de Biologie et de Physique
2005-2017
Abstract In the field of polymer‐based photovoltaic cells, poly(3‐hexylthiophene) (P3HT) and 1‐(3‐methoxycarbonyl)propyl‐1‐phenyl[6,6]C 61 (PCBM) are, to date, most‐studied active materials around world for bulk‐heterojunction structure. Various power‐conversion efficiencies are reported up approximately 5%. This Research News article is focused on a survey tremendous literature published between 2002 2010 that exhibits solar cells based blends P3HT PCBM.
A novel stable bisazide molecule that can freeze the bulk heterojunction morphology at its optimized layout by specifically bonding to fullerenes is reported. The concept demonstrated with various polymers: fullerene derivatives systems enable highly thermally polymer solar cells.
The effect of impurities on the optoelectronic and charge transport properties semiconducting polymers was investigated through performance organic photovoltaics (OPVs) field transistors (OFETs), respectively. A model representative polymer, i.e., poly(3-hexylthiophene) (P3HT), synthesized purified using different methods such as precipitation, metals' complexation, Soxhlet extraction. After purification processes, each fraction analyzed to determine its composition in metals (impurities) by...
A series of new dispiro[fluorene-9',6,9'',12-indeno[1,2b]fluorenes] (DSF-IFs) has been synthesised. These building blocks for blue-light-emitting devices and electroactive polymers combine indenofluorene (IF) spirobifluorene (SBF) properties. We report here our synthetic investigations towards these structures their thermal, structural, photophysical electrochemical properties have compared to those IF SBF. also the anodic oxidation DSF-IFs that leads formation non-soluble transparent...
The active layer of a polymer photovoltaic cell is mainly based on blend two components: semiconducting (electron donor) and fullerene derivative acceptor) to form the bulk heterojunction (BHJ). To offer optimum performances, morphology this has be very carefully controlled at nanoscale. materials BHJ require specific phase segregation enabling photogenerated exciton diffusion dissociation, also ensure pathways for charge carriers electrodes. However, such thermodynamically unstable over...
Novel light emitting electrochemical cells (LECs) are fabricated using CdSe‐CdS (core‐shell) quantum dots (QDs) of tuned size and emission blended with polyvinylcarbazole (PVK) the ionic liquid 1‐butyl‐3‐methylimidazolium hexafluorophosphate (BMIM‐PF 6 ). The performances constructed sequential device layers indium tin oxide (ITO), poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate) (PEDOT:PSS), QD/PVK/IL active layer, Al evaluated. Only color saturated electroluminescence from QDs is...
A–D–A small-molecule electron acceptors containing <italic>meso</italic>-conjugated BODIPY caps were employed in P3HT-based OPV devices, yielding efficiencies as high 1.51%.
Abstract A series of organic–metal chelate complexes symmetric tetradentate Schiff base ligands derived from salicylaldehyde and 2‐hydroxy‐1‐naphthaldehyde were designed investigated. The combination five nonconjugated flexible spacers conjugated rigid with four derivatives provided a forty complexes. blue to red photoluminescent was investigated by UV/Vis absorption luminescence spectroscopy in solution the solid state as well cyclic voltammetry. nature bridge ligand scaffold determined be...
Abstract Here efficient organic photovoltaic devices fabricated from water‐based colloidal dispersions with donor:acceptor composite nanoparticles achieving up to 9.98% power conversion efficiency (PCE) are reported. This high for water processed solar cells is attributed morphology control by surface energy matching between the donor and acceptor materials. Indeed, due a low interfacial acceptor, no large phase separation occurs during nanoparticle formation process as well upon thermal...
Two iridium(III) soft salts based on ion-paired dinuclear cationic and mononuclear anionic complexes were designed investigated as phosphorescent emitters for solution processed OLEDs. New prepared with two different bridging ligands, a carbazole phenylene spacer. Best devices the salt bearing moiety.
The anisotropy of the electronic interactions between fullerenes in crystalline solids was examined using a confocal fluorescence microscope by probing polarization emission arising from fullerene excimer-like emitting states. Crystals C60 obtained vacuum-sublimation or chloroform solution exhibited no little (p = 0 0.11, respectively), as expected high symmetry fcc lattice low degree induced included solvent molecules. use hydrogen-bonding to supramolecularly control interfullerene explored...
Several parameters of the fabrication process inverted polymer bulk heterojunction solar cells based on titanium oxide as an electron selective layer and molybdenum a hole were tested in order to achieve efficient organic photovoltaic cells. Thermal annealing treatment is common optimum morphology, but it proved be damageable for performance this kind We demonstrate using Auger analysis combined with argon etching that diffusion species occurs from MoO3/Ag top layers into active upon thermal...
Great improvements in the development of organic photovoltaic (OPV) devices have been reported over years; however, overall efficiency and operational lifetimes must be improved.
The efficiency of organic photovoltaic (OPV) solar cells is constantly improving; however, the lifetime devices still requires significant improvement if potential OPV to be realised. In this study, several series inverted were fabricated and thermally aged in dark an inert atmosphere. It was demonstrated that all undergo short circuit current-driven degradation, which assigned morphology changes active layer. addition, a previously unreported, open voltage-driven degradation mechanism...
Abstract Organic mixed conductors find use in batteries, bioelectronics technologies, neuromorphic computing, and sensing. While great progress has been achieved, polymer‐based frequently experience significant volumetric changes during ion uptake/rejection, i.e., doping/de‐doping charging/discharging. Although dynamics may be enhanced expanded networks, these can have undesirable consequences, e.g., negatively affecting hole/electron conduction severely shortening device lifetime. Here, the...
A new approach to control molecular aggregation of pi-conjugated chromophores in the solid state has been investigated. Our strategy was use a modifiable bulky fragment which should induce J-aggregation and offer possibility reach an H-aggregation upon its chemical modification by lateral slip molecules. The chosen for that purpose hydrolyzable triethoxysilane function (Si(OEt)3). objective design synthesize electroluminescent or solar cell hybrid organic-inorganic materials sol-gel process...
Herein we propose an approach toward the optimization of photovoltaic performance bulk heterojunctions by tuning composition active layer with respect to molecular weight semiconducting polymer. We used a poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM) blend as typical system and varied P3HT polymer in order determine its influence on heterojunction morphology well optoelectronic characteristics device. have systematically mapped out phase diagram for different...
In bulk heterojunction (BHJ) polymeric organic solar cells (OSCs), the use of processing additives in material formulation has emerged as a promising, cost‐effective, and widely applicable method for optimizing phase separation between donor (D) acceptor (A) materials, thus increasing their efficiency. So far, however, there been no systematic approach identifying suitable given D:A system. A based on Hansen solubility parameters (HSPs) is proposed guiding selection combination. The applied...